JP5263710B2 - Arrangement structure of driving device of image forming apparatus, driving device of image forming apparatus, and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce failures such as disconnection, due to contact of a harness in an image forming apparatus, and also to constitute the image forming apparatus so that firing of a resin gear or the like may hardly occur. <P>SOLUTION: Charging harnesses 142 and 144 as covered conductors are each arranged above a charging bias delivery part 143 as a contact point with a charging roller, and also, above a developing bias delivery part 145 as a contact point between the developing harness 144 and a developing roller. A photoreceptor driving gear 121 that transmits the drive coaxially with the photoreceptor drum, and a developing driving gear 123 that transmits the drive to the developing roller are made to function as drive delivery members. Other drive transmission members 124 to 130 are arranged on the opposite side of the charging harnesses 142 and 144, with respect to the photoreceptor driving gear 121 and the like. Consequently, the failures, such as disconnection, due to the contact of the harness are avoidable. A harness guide 141 holds the charging harnesses 142 and 144, and functions as a partitioning member for avoiding an interference between the harness and the drive transmission means. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an arrangement structure of a driving device of an image forming apparatus, a driving device of an image forming apparatus using the same, and an image forming apparatus using the driving device.

  In the image forming apparatus of the electrophotographic process, the driven unit is a photosensitive drum, a charging roller, a developing roller, an intermediate transfer belt, an intermediate transfer bias roller, a secondary transfer roller, a cleaning roller, an intermediate transfer contact / separation unit, a toner replenishment unit, etc. There is.

  By the way, as the image forming apparatus is reduced in size and space, the drive unit is also reduced in size. Furthermore, it becomes necessary to arrange various harnesses using the space in the drive unit.

  In addition, resin gears, pulleys, and the like tend to be used as drive transmission means of the image forming apparatus. Therefore, if the high-voltage wiring is placed in the vicinity of the resin gear or pulley in the device, the high-voltage wire may cause a spark, which may cause the resin gear or pulley to ignite. come.

JP 2007-155822 A JP 2004-347728 A

  In view of the above problems, the present invention improves the layout of a drive transmission means such as a gear and a harness such as a high-voltage line, and can prevent the occurrence of ignition as described above. It is an object of the present invention to provide an arrangement structure, a driving device for an image forming apparatus, and an image forming apparatus.

According to the first aspect of the arrangement of the driving device of the image forming apparatus of the present invention, the driving source for driving the driven body and the drive transmitting means for transmitting the driving from the driving source to the driven body. A voltage from a holding member that holds the drive source and the drive transmission means and arranges the drive transmission means inside, and a high-voltage power supply circuit that generates a high voltage to be supplied to the charged body. In the arrangement of the driving device of the image forming apparatus, the covered electric wire is formed by covering the lead wire with an insulating material, and the covered electric wire is arranged inside the holding member and viewed from the arrangement side of the driven body. Te, wherein is disposed closer to the one direction side from the contact point of the member to be charged, and the drive transmission means, said than drive pass member to hear dynamic source before as seen from the arrangement side of the driven body It must be placed on the opposite side of the covered wire. The features.

  According to a second aspect of the present invention, in the arrangement structure of the driving device of the image forming apparatus according to the first aspect, a partition is provided between the place where the covered electric wire is wound and the drive transmission means. It is characterized by that.

  According to a third aspect of the present invention, in the arrangement structure of the driving device of the image forming apparatus according to the second aspect, the partition is integrated with the holding member.

  According to a fourth aspect of the image forming apparatus driving apparatus of the present invention, the arrangement structure of the driving apparatus for the image forming apparatus according to any one of the first to third aspects is used.

  According to a fifth aspect of the present invention, in the driving apparatus for an image forming apparatus according to the fourth aspect, the driven body is an image carrier.

  According to a sixth aspect of the present invention, in the driving apparatus for an image forming apparatus according to the fourth or fifth aspect, the driven body is a developing unit.

  According to a seventh aspect of the present invention, in the driving apparatus for an image forming apparatus according to any one of the fourth to sixth aspects, the driven body is a transfer unit.

  According to an eighth aspect of the present invention, in the image forming apparatus driving apparatus according to any one of the fifth to seventh aspects, the charged body is a charging unit for charging the surface of the image carrier. And

  According to a ninth aspect of the present invention, in the image forming apparatus drive device according to any one of the fourth to eighth aspects, the member to be charged is a bias roller of a transfer unit.

  An image forming apparatus according to a tenth aspect of the present invention uses the drive device for an image forming apparatus according to any one of the fourth to ninth aspects.

  According to the present invention, it is possible to reduce problems such as disconnection due to the contact of the harness with the drive transmission means by collecting the layout of the drive transmission means such as gears and the harnesses such as the high-voltage lines on the opposite sides. Also, by collecting the drive transmission means such as gears and the layout of the harnesses such as high voltage wires on the opposite sides, it is possible to make the resin gears difficult to ignite.

  The best mode for carrying out the present invention will be described below with reference to the embodiments shown in the drawings. In the embodiments described below, a printer will be described as an example. However, the present invention is not limited to this configuration, and can be applied to other image forming apparatuses.

  According to the present invention, as the image forming apparatus is reduced in size and space, the drive unit is also reduced in size, and further, various harnesses need to be arranged using the space in the drive unit. Therefore, by gathering the layout of the drive transmission means such as gears and the harnesses such as high-voltage lines on the opposite sides, problems such as disconnection due to contact of the harness with the drive transmission means are reduced. Although it is possible to escape the harness in the depth direction when viewed from the driven body side, the thickness increases in the depth direction, which is not suitable for downsizing and space saving. Also, since resin gears and pulleys are often used as the drive transmission means of the image forming apparatus, if the high-voltage line is arranged in the vicinity of the layout of the resin gear or pulley, the high-voltage line is sparked or the like. This causes the problem that resin gears and pulleys are likely to ignite, so in the present invention, the layout of drive transmission means such as gears and harnesses such as high-voltage lines are gathered on the opposite sides. The above-mentioned ignition is made difficult to occur.

  In addition, the present invention further reduces the risk of ignition as described above by providing a partition between the scooping portion of the covered electric wire and the drive transmission means, and further reduces the risk of ignition. Yes.

  In the present invention, the partition is integrated with the holding member, the number of parts is reduced, and the cost is reduced.

  Furthermore, the present invention uses the above-described arrangement of the driving device of the image forming apparatus for the driving device of the image forming apparatus, similarly reduces defects such as disconnection due to contact of the harness, and prevents ignition of resin gears, etc. It is made difficult to occur.

  In the image forming apparatus, since the surface of the image carrier can be charged with a latent image by uniformly charging the surface, a charging means for charging the image carrier is necessary near the image carrier, and the coated wire is connected with the image. In many cases, the drive source of the image forming apparatus of the present invention described above is used in the present invention to ignite the drive source and the drive transmission means. I try to suppress it.

  In the image forming apparatus, the developing unit is disposed in the vicinity of the image carrier. However, a charging unit for charging the developing unit is required in the vicinity of the image carrier, and the coated wire is in the vicinity of the driving source of the developing unit and the driving transmission unit. In the present invention, the firing of the drive source and the drive transmission means is suppressed by using the drive device of the image forming apparatus described above.

  Further, in the image forming apparatus, an image is transferred from an image carrier to an intermediate transfer belt having a transfer bias applied to the surface by a transfer means, and the image is formed on a recording sheet at a nip portion with a secondary transfer portion. In the present invention, since it is necessary to apply a bias to the intermediate transfer belt installed in the transfer unit, the coated wire is often disposed in the vicinity of the drive source and the drive transmission unit of the transfer unit. By using the drive device of the image forming apparatus, ignition of the drive source and the drive transmission means is suppressed.

  Further, since the charging means used in the image forming apparatus requires a high voltage, in the present invention, a conductive wire that includes a conductive wire that leads the high voltage from the high-voltage power supply circuit to the object to be charged, and an insulating material that covers the conductive wire. Are connected, and the ignition of the drive source and the drive transmission means arranged in the vicinity thereof is suppressed.

  Further, since the bias roller of the transfer unit used in the image forming apparatus requires a high voltage, the present invention includes a conductive wire that leads the high voltage from the high-voltage power supply circuit to the charged body, and an insulating material that covers the conductive wire. The covered electric wire to be connected is connected, and the ignition of the drive source and the drive transmission means arranged in the vicinity thereof is suppressed.

  FIG. 1 is a schematic configuration diagram illustrating an image forming apparatus according to the present embodiment. The image forming apparatus 100 generates toner images that are visible images of yellow, magenta, cyan, and black (hereinafter referred to as “Y”, “M”, “C”, and “K”, respectively). Two process cartridges 6Y, 6M, 6C and 6K are provided. These use Y toner, M toner, C toner, and K toner of different colors as the image forming agent, but the other configurations are the same. Each of the process cartridges 6Y, 6M, 6C, and 6K can be attached to and detached from the main body of the image forming apparatus 100, and the consumable parts can be replaced at a time. Hereinafter, the process cartridge 6Y for generating a Y toner image will be described as an example.

  FIG. 2 is a schematic configuration diagram showing a process cartridge 6Y for generating a Y toner image. The process cartridge 6Y includes a photosensitive drum 1Y as a latent image carrier, a drum cleaning device 2Y, a charge eliminating device (not shown), a charging device 4Y, a developing device 5Y, and the like. The charging device 4Y uniformly charges the surface of the photosensitive drum 1Y that is rotated clockwise in the drawing by a drum driving mechanism (not shown). The uniformly charged surface of the photosensitive drum 1Y is exposed and scanned by the laser light L to carry an electrostatic latent image for Y. The Y electrostatic latent image is developed into a Y toner image by the developing device 5Y using Y toner. Then, intermediate transfer is performed on the intermediate transfer belt 8. The drum cleaning device 2Y removes the toner remaining on the surface of the photosensitive drum 1Y after the intermediate transfer process. The static eliminator neutralizes residual charges on the photosensitive drum 1Y after cleaning. By this charge removal, the surface of the photosensitive drum 1Y is initialized and prepared for the next image formation. Similarly, in the other process cartridges 6M, 6C, and 6K, M toner images, C toner images, and K toner images are formed on the photosensitive drums 1M, 1C, and 1K, respectively. Transcribed.

  Further, as shown in FIG. 1, an exposure device 7 is disposed below each process cartridge 6Y, 6M, 6C, 6K in the drawing. The exposure device 7 serving as a latent image forming unit irradiates the photosensitive drums 1Y, 1M, 1C, and 1K in the process cartridges 6Y, 6M, 6C, and 6K with a laser beam L emitted based on the image information. . By this exposure, Y electrostatic latent images, M electrostatic latent images, C electrostatic latent images, and K electrostatic latent images are formed on the photosensitive drums 1Y, 1M, 1C, and 1K, respectively. The exposure device 7 irradiates the photosensitive drum with a laser beam L emitted from a light source through a plurality of optical lenses and mirrors while scanning with a polygon mirror rotated by a motor.

  In FIG. 1, on the lower side of the exposure apparatus 7 in the drawing, paper supply means including a paper storage cassette 26, a paper supply roller 27 incorporated therein, a registration roller pair 28, and the like are disposed. The paper storage cassette 26 stores a plurality of transfer papers P as recording materials, and a paper feed roller 27 is brought into contact with the uppermost transfer paper P. When the paper feeding roller 27 is rotated counterclockwise in the drawing by a driving mechanism (not shown), the uppermost transfer paper P is fed toward the rollers of the registration roller pair 28. The registration roller pair 28 rotationally drives both rollers to sandwich the transfer paper P, but temporarily stops rotating immediately after sandwiching. Then, the transfer paper P is sent out toward a later-described secondary transfer nip at an appropriate timing.

  Further, in FIG. 1, an intermediate transfer unit 15 that moves an endlessly while stretching an intermediate transfer belt 8 as an intermediate transfer member, which is a transfer material, is disposed above the process cartridges 6Y, 6M, 6C, and 6K. It is installed. The intermediate transfer unit 15 includes a belt cleaning device 10 in addition to the intermediate transfer belt 8. Also provided are four primary transfer bias rollers 9Y, 9M, 9C, 9K, a secondary transfer backup roller 12, a cleaning backup roller 13, a tension roller 14, and the like.

  The intermediate transfer belt 8 is endlessly moved in the counterclockwise direction in the figure by the rotational drive of at least one of the rollers while being stretched around these seven rollers. The primary transfer bias rollers 9Y, 9M, 9C, and 9K respectively sandwich the intermediate transfer belt 8 that is moved endlessly in this manner between the photosensitive drums 1Y, 1M, 1C, and 1K, respectively. Is forming. In these systems, a transfer bias having a polarity opposite to that of toner (for example, plus polarity) is applied to the back surface (inner circumferential surface of the loop) of the intermediate transfer belt 8. All the rollers except the primary transfer bias rollers 9Y, 9M, 9C, and 9K are electrically grounded. The intermediate transfer belt 8 sequentially passes through the primary transfer nips for Y, M, C, and K along with the endless movement thereof, and the Y toner images on the photosensitive drums 1Y, 1M, 1C, and 1K. , The M toner image, the C toner image, and the K toner image are superimposed and primarily transferred. As a result, a four-color superimposed toner image (hereinafter referred to as “four-color toner image”) is formed on the intermediate transfer belt 8.

  The intermediate transfer unit 15 includes a contact / separation mechanism (not shown) for contacting and separating the intermediate transfer belt 8 with respect to the photosensitive drums 1Y, 1M, and 1C in a state where the intermediate transfer belt 8 is in contact with the photosensitive drum 1K. Is also provided. The secondary transfer backup roller 12 sandwiches the intermediate transfer belt 8 between the secondary transfer roller 19 and forms a secondary transfer nip. The four-color toner image formed on the intermediate transfer belt 8 is transferred to the transfer paper P at the secondary transfer nip. Then, combined with the white color of the transfer paper P, a full color toner image is obtained. Untransferred toner that has not been transferred onto the transfer paper P adheres to the intermediate transfer belt 8 after passing through the secondary transfer nip.

  This is cleaned by the belt cleaning device 10. At the secondary transfer nip, the transfer paper P is sandwiched between the intermediate transfer belt 8 and the secondary transfer roller 19 whose surfaces move in the forward direction, and is conveyed in the opposite direction to the registration roller pair 28 side. When the transfer paper P sent out from the secondary transfer nip passes between the rollers of the fixing unit 20 as a detachable unit with respect to the main body of the image forming apparatus, it is affected by heat, pressure, and full surface color. The toner image is fixed. Thereafter, the transfer paper P is discharged out of the apparatus through a pair of paper discharge rollers 29. A stack portion 50a is formed on the upper surface of the housing of the image forming apparatus main body, and the transfer paper P discharged to the outside by the discharge roller pair 29 is sequentially stacked on the stack portion 50a.

  A bottle support portion 51 is disposed between the intermediate transfer unit 15 and the stack portion 50a located above the intermediate transfer unit 15. In the bottle support portion 51, toner bottles 52Y, 52M, 52C, and 52K are set as agent containers for storing the respective color toners. The color toners in the toner bottles 52Y, 52M, 52C, and 52K are appropriately supplied to the developing devices of the process cartridges 6Y, 6M, 6C, and 6K by a toner supply device (not shown). The toner bottles 52Y, 52M, 52C, and 52K can be attached to and detached from the main body of the image forming apparatus 100 independently of the process cartridges 6Y, 6M, 6C, and 6K.

  FIG. 3 is a perspective view of the driving device of the image forming apparatus according to the embodiment of the present invention. 4 shows a perspective view in the case where the drive sources 101 to 103 and the holding members 112 to 113 on the side where the drive sources are attached are not shown in the perspective view of FIG. Further, FIG. 5 is a perspective view when the photosensitive member driving gear 121 (Y, M, C, K) is not shown, and FIG. 6 is a developing driving gear 123 (Y, M, C, K) and a developing driving gear holding member 114. The perspective view in the case of not showing is shown.

  From these figures, the charging harness 142 which is a covered electric wire and the developing harness 144 which is also a covered electric wire are respectively connected to a charging bias delivery unit 143 (Y, M, C, K) which is a contact point with a charging roller (not shown), and development. It can be seen that the developing bias transfer section 145 (Y, M, C, K), which is a contact point between the harness 144 and a developing roller (not shown), is disposed above the developing roller.

  Further, a photosensitive member driving gear 121 (Y, M, C, K) that transmits driving coaxially with a photosensitive drum (not shown) and a developing driving gear 123 that transmits driving to a developing roller in a developing unit (not shown). Is a drive delivery member to the driven source. The other drive transmission members 124 to 130 are below the photosensitive member drive gear 121 (Y, M, C, K) and the development drive gear 123 (Y, M, C, K), that is, the charging harness 142 and the development harness. It is arranged on the opposite side to where 144 is arranged.

  Thereby, the drive transmission members 121 to 130 and the charging harnesses 142 and 144 can be gathered on the opposite sides, respectively, and problems such as disconnection due to contact can be avoided. The harness guide 141 holds the charging harness 142 and the developing harness 144 and functions as a partition for avoiding interference with the drive transmission means.

  FIG. 7 is an enlarged view of an embodiment in which the photoconductor gear positioning member 115 (Y) is translucent. In this embodiment, the photoconductor gear positioning member 115 (Y) also serves as a developing gear positioning member, and also functions as a mounting member for the charging bias transfer portion 143 (Y) and the developing bias transfer portion 145 (Y). As a result, as in the process cartridge shown in FIG. 2, each transfer unit is also provided in a process cartridge form in which the photosensitive drum 1 (Y), the charging device 4 (Y), and the developing device 5 (Y) are integrated. Thus, it is possible to perform layout while suppressing the amount of positional deviation.

  Further, the photoconductor gear positioning member 115 (Y) also functions as a partition between the charging harness 142 and the photoconductor gear 121 (Y) at the partition 115 a (Y).

Schematic configuration diagram showing an image forming apparatus according to the present embodiment Schematic configuration diagram showing a process cartridge for generating a Y toner image 1 is a perspective view of a drive device of an image forming apparatus according to an embodiment of the invention. The perspective view which abbreviate | omitted the holding member of the side to which the drive source and the drive source are attached from FIG. Similarly, a perspective view when the illustration of the photosensitive member driving gear is omitted Similarly, a perspective view when the development drive gear and the development drive gear holding member are not shown. Enlarged view of the embodiment in which the photoconductor gear positioning member is translucent

Explanation of symbols

1: Photosensitive drum 2: Drum cleaning device 4: Charging device 5: Developing device 6: Process cartridge 7: Exposure device 8: Intermediate transfer belt 9: Primary transfer bias roller 10: Belt cleaning device 12: Secondary transfer backup roller 13: Cleaning backup roller 14: Tension roller 15: Intermediate transfer unit 19: Secondary transfer roller 20: Fixing unit 26: Paper storage cassette 27: Paper feed roller 28: Registration roller pair 29: Paper discharge roller pair 50a: Stack unit 51 : Bottle support unit 52: toner bottle 100: image forming apparatus 101 to 103: drive source 112 to 113: holding member 114: development drive gear holding member 115: photoconductor gear positioning member 115 a: partition 121: photoconductor drive gear 123: Development drive gear 124〜1 0: drive transmission member 142: charging harness 143: charging bias transfer unit 144: developing Harness 145: developing bias transfer unit L: laser light P: transfer paper

Claims (10)

A drive source for driving the driven body;
Drive transmission means for transmitting drive from the drive source to the driven body;
A holding member that holds the drive source and the drive transmission means and arranges the drive transmission means inside;
A covered electric wire formed by coating a conductive wire that guides a voltage from a high-voltage power supply circuit that generates a high voltage to be supplied to an object to be charged to the object to be charged, with an insulating material;
In the arrangement structure of the drive device of the image forming apparatus comprising:
The covered electric wire is disposed inside the holding member;
Wherein when viewed from the arrangement side of the driven body, wherein are disposed closer to the one direction side from the contact point of the member to be charged, and the drive transmission means, the front when viewed from the arrangement side of the driven body hear movement An arrangement structure of a driving device of an image forming apparatus, wherein the arrangement is arranged on a side opposite to a side where the covered electric wire is arranged with respect to a driving delivery member to a source.
In the arrangement structure of the drive device of the image forming apparatus according to claim 1,
An arrangement structure of a driving device of an image forming apparatus, wherein a partition is provided between a place where the covered electric wire is wound and the drive transmission means. The drive structure of the image forming apparatus according to claim 2,
An arrangement structure of a driving device of an image forming apparatus, wherein the partition is integrated with the holding member. 4. An image forming apparatus driving apparatus comprising the image forming apparatus driving apparatus arrangement structure according to claim 1. The drive device for an image forming apparatus according to claim 4.
A driving apparatus for an image forming apparatus, wherein the driven body is an image carrier. In the drive device of the image forming device according to claim 4 or 5,
A driving apparatus for an image forming apparatus, wherein the driven body is a developing unit. The drive device for an image forming apparatus according to any one of claims 4 to 6,
A driving apparatus for an image forming apparatus, wherein the driven body is a transfer unit. The drive device for an image forming apparatus according to any one of claims 5 to 7,
An image forming apparatus driving apparatus, wherein the member to be charged is a charging unit for charging the surface of the image carrier. The drive device for an image forming apparatus according to any one of claims 4 to 8,
An image forming apparatus driving apparatus, wherein the member to be charged is a bias roller of a transfer unit. An image forming apparatus using the drive device for an image forming apparatus according to claim 4.